In a statement, Blackburn said information from the organizations "is critical to providing us with answers to questions the American people are asking."

Illinois Rep. Jan Schakowsky, top Democrat on the investigative panel, called the subpoenas unjustifiable and abusive. Schakowsky said Republicans want to build a database of patients, doctors and researchers that would risk their privacy and safety.

The subpoenas are "a new low in the Republicans' attack on women's health care," Schakowsky said.

The subpoenas seek information on people involved in procuring tissue, where it came from and where it went.

House Republicans created the special panel last October as an outgrowth of the conservative furor over secretly recorded videos showing Planned Parenthood officials discussing how they sometimes supply fetal tissue to scientists. Republicans and conservatives have denounced the practice and some have accused the organization of illegally selling the organs for profit.

Planned Parenthood has denied wrongdoing. Investigations by several congressional panels and states have yet to produce evidence that it acted illegally.

Blackburn says her panel may hold an initial hearing next month and aims to produce a report by late this year.